User Registration File Upload 1.3.11

* Feature - Add tooltip for file upload field label in frontend.
* Enhance - Display icons for uploaded files according to extension.
* Tweak - Replace incremental file name function with WordPress default.
* Fix - File upload not working from admin side edit user.
* Fix - Remove uploaded files if the user does not register.
* Fix - Removed file from media occupies the space in users file upload field.

* Fix - File upload path permission denied due to no existence of file directory.

* Enhance - File upload to `user_registration_uploads/file-uploads` folder.
* Enhance - Remove file from directory when file is removed by user.
* Enhance - Remove file from directory when user is deleted.
* Tweak - Incremental file name for duplicate files.